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This lens may just be the ticket I'm looking for!  I shoot ranch dog and herding trial events (professionally) in an extremely dusty environment.  I've been using a Nikon 80-400 for arena work and my Sigma 150-600 Sport when the dogs bring livestock in from long distances, both with my Nikon D4s.  Over the years my Nikon lens has become full of dirt (a known problem) the zoom mechanism is so difficult to rotate that my hand has become damaged.  It costs a lot to send in for repairs, just to get full of dirt again.  My 150-600 is too long on the short end for the arena work when the dogs run closer to me.  The new Sigma, being dust and weatherproof, would probably be a better investment than repairs to the 80-400.  Now, I wonder how difficult the zoom is to turn since I typically am constantly using extreme variations in focal length and my hand has arthritis as a result of working this filthy 80-400!  Oh, and now my focus and vibration reduction is bouncing around... pretty much toast?

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